Hub Flange vs Blind Flange
Table of Content
- What is Hub Flange?
- What is Blind Flange?
- Difference Between Hub Flange vs Blind Flange
- Applications of Hub in Flange and Blank Flange
- Ultimate Guide to Blind Flange and Hub Flange Types
- Common Gaskets for Tapered Hub Flange and Tapered Blind Flange
- Purpose of the Hub in Flange
- Hub vs. Non Hub Flange
- Threaded Hub Flange Standards by Size Range
- Hub Flanges Dimensions
- Face Types of Blind Flange with Hub
Hub in flange are available in various sizes to hold different pipe dimensions. High hub flange is their direct installation process, requiring only nuts and bolts for connection, no need welding. Hub flange has an internal bore extending beyond its face. Threaded hub flange commonly made from materials like carbon steel, brass, stainless steel, or aluminium. dual flange hub are used in applications that require precise alignment. Tapered hub flange suitable for high pressure and temperature environments.
ASME B16.5 Blind flange is a circular plate without a central hole. Blank flange used to seal off the end of a pipe. Stainless steel blind flange seals off the end of an open line and provides support for the pipe. High hub blind flange are generally made from carbon steel, stainless steel, alloy steel, duplex, super duplex, and nickel alloy. Tapped blind flange typically come in two halves which can be bolted together. Blind flange with threaded hole providing a secure seal to prevent fluid flow.
Difference Between Hub Flange vs Blind Flange
| Feature | Hub Flange | Blind Flange | |
| Sizes | 1/2″ to 24″ | 4″ to 96″ | |
| Standards | AWWA C207 | ASME B16.5 | |
| Strength | Provides additional strength | Creates a secure seal | |
| Design | Contains a hub for alignment | Solid face with no hole | |
| Made from | Cast iron or steel | Various materials | |
| Uses | Joins two equipment | Seals off the pipe end | |
| Applications | Low pressure applications | High pressure applications | |
| Class | Class D, Class E | Class 150 to 2500 |
Hub in Flange vs Blank Flange – What’s the Applications Difference
Applications of Hub in Flange and Blank Flange
| Hub Flange Applications | Applications of Blank Flange |
| Oil and Gas | Piping Systems |
| Water Treatment | Storage Tanks |
| Chemical Processing | Power Generation |
| Construction | Heavy Industry |
| Manufacturing Plants | Safety Systems |
Common Types of BLRF Flange vs Hub Flange as per AWWA C207
Ultimate Guide to Blind Flange and Hub Flange Types
| Blind Flanges Types | Hub Flange Types |
| Dual Flange Hub | Blank Flange |
| High Hub Flange | High Hub Blind Flange |
| Tapered Hub Flange | Tapped Blind Flange |
| Threaded Hub Flange | Double Blind Flange |
| Low Hub Flange | Blind Flange With Threaded Hole |
| Large Flange Hubs | Blind Flange With Hub |
Find Recommended Gaskets for High Hub Flange and High Hub Blind Flange
Common Gaskets for Tapered Hub Flange and Tapered Blind Flange
| Hub Flange Gasket | Blind Flange Gasket |
| Hub Gasket | Full Face Gasket |
| Drive Flange Gasket | Non-Metallic Gaskets |
| Locking Hub Flange Gasket | PTFE Gasket |
- High Durability
- Weld Strength
- Alignment
- Reinforcement
- Hub Flange = Extra collar for proper stress transfer
- Non Hub Flange = Flat disc with bolt holes
Threaded Hub Flange Standards by Size Range
| Standard | Sizes |
| ASME B16.5 | ½” to 24″ |
| ASME B16.47 | 26″ to 60″ |
| AWWA C207 | 4″ to 96″ |
| MSS SP-44 | 26″ to 60″ |
| NPS | Wall Thickness | O.D. | ID of Hub Bore |
| 78″ – 144″ | 1.75″ – 3.00″ | 94.0″ – 176.0″ | 78.3″ – 144.3″ |
| 54″ to 72″ | 1.50″ to 2.25″ | 68.0″ to 87.0″ | 54.3″ to 72.2″ |
| 36″ to 48″ | 1.25″ to 2.00″ | 44.5″ to 61.0″ | 36.2″ to 48.3″ |
| 24″ to 30″ | 1.00″ to 1.75″ | 32.0″ to 38.8″ | 24.2″ to 30.2″ |
| 14″ to 20″ | 0.75″ to 1.00″ | 21.0″ to 27.5″ | 14.2″ to 20.2″ |
| 8″ to 12″ | 1.00″ to 1.25″ | 13.5″ to 19.0″ | 8.6″ to 12.9″ |
| 4″ to 6″ | 0.94″ to 1.00″ | 9.0″ to 11.0″ | 4.5″ to 6.7″ |
Face Types of Blind Flange with Hub
- Raised Face Blind Flange
- Flat Face Blind Flange
- RTJ Blind Flange